Pipe plug lock unit



FIG. 1 is a top perspective view of a pipe plug unit showing our new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image of the right side;

FIG. 3 is a top plan view thereof;

FIG. 4 is another top perspective view thereof showing the unit in an open position;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevation view thereof.

The broken line representation of a pipe plug in FIGS. 1, 2 and 4 and a lock in FIGS. 2 and 4 are for purposes of illustration only and forms no part of the claimed design. 

The ornamental design for the pipe plug lock unit, as shown and described. 